一种通用型三相电力系统谐波电流检测方法  

A Universal Three-phase Power System Harmonic Current Detection Method

作　　者：孟颖 文晓燕 MENG Ying;WEN Xiaoyan(School of Electrical and Information Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044 China)

机构地区：[1]北京建筑大学电气与信息工程学院

出　　处：《电气工程学报》2019年第3期67-73,共7页Journal of Electrical Engineering

基　　金：北京建筑大学科学研究基金(00331614019)和北京建筑大学市属高校基本科研业务费专项资金(X18073)资助项目

摘　　要：谐波电流检测是进行谐波抑制和电能质量优化的前提。由于传统的ip-iq检测法在三相不对称系统中存在误差,提出了一种基于ip-iq检测法的改进方法。该改进方法利用对称分量法、三角函数变换、坐标变换等数学运算方法,分离出电网中的负序分量,使谐波电流检测的结果更加准确;通过设定与电网电压相等的频率来代替ip-iq检测法坐标变换矩阵中的频率,可以消除锁相环引起的相位计算不准确问题;通过添加零序电流分离模块使之可以同时适用于三相三线制和三相四线制电路。利用Matlab/Simulink软件搭建仿真模型并进行仿真验证,结果表明,该改进法可以更准确地检测出三相对称系统和不对称系统中的谐波电流和基波电流,证明了这种改进方法的可行性。Harmonic current detection is the precondition for harmonic suppression and power quality optimization.Considering traditional ip-iq detection methods have errors in three-phase asymmetric systems,an improved detection method based on ip-iq detection is proposed.By using symmetrical component method,trigonometric function transformation,coordinate transformation and other mathematical operations,the negative sequence components of the fundamental wave can be separated from the power grid current,which makes the result of harmonic current detection more accurate.By setting the frequency in the transformation matrix of the ip-iq detection method as a fixed value equaling to grid frequency,the problem of phase uncertainty caused by the phase locked loop can be eliminated.By adding zero sequence current separation modules,the method can also be applied to three-phase three wire and three-phase four wire circuits.Using the Matlab/Simulink software to model and verify the simulation results,the results show that the improved method can detect the harmonic current and fundamental current in the three-phase symmetrical system and asymmetric system more accurately,thus the feasibility of the improved method is proved.

关 键 词：谐波电流检测 ip-iq检测法 负序分量 无锁相环 零序分量 

分 类 号：TM935[电气工程—电力电子与电力传动]